给健康人一小点病毒，比如流感病毒或者脊髓灰质炎病毒，这些病毒非常脆弱，不至于引发疾病，但对让人体认识到某种病原体却恰好足够了。
A healthy person is given a tiny taste of a virus flu or polio, say that's too weak to cause illness but just enough to introduce the body to the pathogen.
2002年人们完成了五年前开始的脊髓灰质炎病毒的基因组全序列的测定，三年后同样规模的一个团队只花了一周的时间做了一个相似长度的基因组测序。
In 2002 it took five years to develop the genomic sequence of a polio virus. Three years later it took a week for a team the same size to do the same on a virus of similar length.
2002年人们完成了五年前开始的脊髓灰质炎病毒的基因组全序列的测定，三年后同样规模的一个团队只花了一周的时间做了一个相似长度的基因组测序。
In 2002 it took five years to develop the genomic sequence of a polio virus. Three years later it took a week for a team the same size to do the same on a virus of similar length.
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